summation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or process of adding; addition.
• noun A sum or aggregate.
• noun A concluding argument after the presentation of a legal case, especially an argument made to a judge or jury by an attorney for a party as to why that party should prevail.
• noun Physiology The process by which multiple or repeated stimuli can produce a response in a nerve, muscle, or other part that one stimulus alone cannot produce.

from The Century Dictionary.

• noun Addition; specifically, the process of finding the sum of a series, or the limit toward which the sum of an infinite series converges; any combination of particular quantities in a total.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of summing, or forming a sum, or total amount; also, an aggregate.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A summarization.
• noun mathematics : An adding up of a series of items.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the arithmetic operation of summing; calculating the sum of two or more numbers
• noun a concluding summary (as in presenting a case before a law court)
• noun (physiology) the process whereby multiple stimuli can produce a response (in a muscle or nerve or other part) that one stimulus alone does not produce
• noun the final aggregate